As final exams drew closer, some Hogwarts students began acting strangely due to the immense pressure, particularly those in the fifth and seventh years, whose tempers were shorter than usual.
Because of this, various study-aid potions prepared specifically for test-takers by Fred and George proved wildly popular among the Hogwarts student body. The most sought-after item was a small purple pill that helped students quickly concentrate, boost their brainpower, and improve memory. Taking one before a review session helped students get into the studying zone in no time.
Meanwhile, the Draught of Peace—which cured exam insomnia—and the Calming Draught, which helped restore a normal state of mind, effectively helped students regulate their pre-exam anxiety and allowed them to focus on the final sprint of their revision.
Chapter 1557